Punishing the pseudo-opposition: Accountability under a minority government

Minority governments often rely on the legislative support of parties, which play an ambiguous role in politics: while they are formally part of the opposition, they are simultaneously committed to keeping the government in office and passing its bills. Are these support parties protected from the electoral cost of governing or do voters recognize their responsibility for policy outcomes and hold them accountable? I hypothesize that voters who are dissatisfied with government performance will have less sympathy towards and will be less likely to vote for support parties. Using Comparative Study of Electoral Systems data, I find consistent support for both hypotheses. Voters seem to recognize the connection between support parties and the government and have both an affective and an electoral response to it. While voters dislike support parties more than junior members when they are dissatisfied with government performance, they punish the two types of parties similarly at elections. Support parties are thus in no way exempt from the accountability mechanisms.